RFR 8207367: 10 vmTestbase/nsk/jdi tests timed out when running with jtreg

[Daniil Titov]

Please review the change that fixes timeout issues for the following 10 tests when running with jtreg and default timeout factor (1.0).

For the following 2 tests the event wait timeout was reduced and adjusted for test.timeout.factor.  Method receiveEvents(long,pattern) was fixed to ensure that it gracefully exits after the specified wait period elapsed:
  -vmTestbase/nsk/jdi/ClassUnloadRequest/addClassExclusionFilter/exclfilter001.java
  -vmTestbase/nsk/jdi/ClassUnloadRequest/addClassFilter/filter001.java

For these 3 tests the event wait timeout was reduced and adjusted for test.timeout.factor:
  -vmTestbase/nsk/jdi/Event/_itself_/event001.java
  -vmTestbase/nsk/jdi/VirtualMachine/suspend/suspend001/TestDescription.java
  -vmTestbase/nsk/jdi/ThreadReference/suspend/suspend001.java

For next 2 tests the event wait timeout and the thread sleep time were reduced and adjusted for test.timeout.factor. Additional synchronization between the debugger and the debuggee was added to ensure the debugee process continues as soon as the test finishes the timeout related checks and advances to the next steps:
  - vmTestbase/nsk/jdi/EventQueue/remove_l/remove_l004/TestDescription.java 
  - vmTestbase/nsk/jdi/EventQueue/remove/remove004/TestDescription.java

Instead of just sleeping for 5 minutes while waiting for the debuggee test thread to complete  the tests now check whether the debuggee thread is alive in the loop. The total waiting timeout was adjusted for test.timeout.factor:
  -vmTestbase/nsk/jdi/VirtualMachine/dispose/dispose004/TestDescription.java 
  -vmTestbase/nsk/jdi/VirtualMachine/dispose/dispose003/TestDescription.java  
  -vmTestbase/nsk/jdi/VirtualMachine/dispose/dispose002/TestDescription.java

Testing.
The following VM options were used  in Mach5 jobs to  verify these changes:
1. No VM args
2. -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+TieredCompilation -XX:+UseJVMCICompiler -Djvmci.Compiler=grail
3. -Xcomp 

Also tier1, tier2 and tier3 Mach5 jobs succeeded.

To verify that tests succeed with test.timeout.factor set to 1.0 the following patch was used before running Mach5 jobs.

--- a/make/RunTests.gmk Thu Feb 21 15:17:42 2019 -0800
+++ b/make/RunTests.gmk Thu Feb 21 15:42:15 2019 -0800
@@ -826,6 +826,7 @@
   else
     JTREG_TIMEOUT_FACTOR ?= 4
   endif
+  JTREG_TIMEOUT_FACTOR = 1
   JTREG_VERBOSE ?= fail,error,summary
   JTREG_RETAIN ?= fail,error

Bug: https://bugs.openjdk.java.net/browse/JDK-8207367 
Webrev: http://cr.openjdk.java.net/~dtitov/8207367/webrev.01

Thanks!
--Daniil